Wrench



Oct. 15, 1929. A. coLOGNORI WRENCH Filed March 30, 1929 IN V EN TOR. aw W4;

'5 5 ATTORNEYZ.

Patented Oct. 15 1929 UNITED STATES PATENT OFFICE ALDO GOLOGNORI, F BROOKLYN, NEW YORK, ASSIGNOR 0F ONE-HALF TU LOUIS WERKSTELL, 0F BROOKLYN, NEW YORK WRENCH Application filed March 30, 1929. Serial No. 851,207.

This invention relates to wrenches.

An object of this invention is to provide a wrench having novel and improved nut gripping means for preventing said wrench from slipping 0d the nut.

A further object of this invention is to provide a neat, rugged and durable device of the character described which shall be relatively cheap to manufacture, simple to ma 1o nipulate and withal practical and etlicient to a high degree in use.

Uther objects of this invention will in part be obvious and in part hereinafter pointed out.

The invention accordingly consists in the features of construction, combinations of elements, and arrangement of parts which will be exemplified in the construction hereinafter described, and of which the scope of .20 application will be indicated in the following claims.

In the accompanying drawing, in which is shown one of the various possible illustrative embodiments of this invention,

Fig. 1 is a side elevational view of a wrench embodying the invention, in nut engaging position;

Fig. 2 is a cross-sectional view taken on line 2-2 of Fig. 1;

Fig. 3 is a cross-sectional view taken on line 33 of Fig. 2; and

Fig. 4: is a side elevational view of the wrench with parts broken away illustrating the position of the parts prior to receiving a nut, or after being Withdrawn therefrom.

Referring in detail to the drawing, designates a wrench embodying the invention here seen to comprise a head portion 12 and shank or handle portion 11.

The head 12 comprises a pair of symmetrical jaws 13 and 14: shaped to receive a nut for turning the same. For the purpose of illustration only, the jaws 13, 14: shown are shaped to receive a hexagonal nut 15, said jaws having parallel inner edge portions 18*, 14c for engaging opposite sides of said nut, and portions 13 14 forming an angle for engaging an apex portion of said nut.

Wrenches of the character described have been found defective by reason of the ease with which they slip out of engagement with the nuts while tightening the same on the bolts. To substantially obviate the dillculty, in accordance with the invention, means is provided for obtaining a firm grip on the nut while turning the same, thus lessening the danger of accidentally disengaging the wrench from said nut. To this end, each of jaws 13, 1a is bifurcated or slotted as at 17 and 18, respectively, and pivotally mounted in said slots as on transverse pins 19 and 20,

are plate members 21 and 22. Said memhere 21 and 22 are snmlarly shaped and symmetrically d1sposed, each being provided with a three sided cut out portion 2 1 for engaging three sides of the hexagonal nut 15. The outer edge portion 25, 26 of said members 21, 22 are preferably curved to conform to the outer edge portions 28, 29 of the jaws 13, 14 respectively. The slots 17 and 18 are formed for allowing pivotal movement of said mem bers 21 and 22 from the position shown in Fig. 4K to that of Figs. 1 and 2. The former figure shows the position of the wrench prior to engaging a nut or just after disengaging the wrench therefrom, whereas, the Figs. 1. and 3 show the wrench in nut engaging position. In sliding the wrench onto the nut for engaging the same, the apex portion of the nut striking the inner end portions 30 and 31 of said members 21 and 22 causes pivotal movement of the members to the position of Fig. 1, the outer portions 32 and 33 of said members pressing inwardly on said nut to retain the same in the grip of the wrench.

It will be noted that the pivot pins 19, 20 are closer to the outer end portions 32, 33 of said members 21, 22 than to the inner end portions 30, 31 thereof so that a comparatively longer leverage results for increasing the force pressing on the nut to retain the same in engaged position.

To remove the wrench. after completion of the nut turning or tightening operation, it is merely necessary to pull the handle 12 in a direction away from the nut, the members 21, 22 then being pivoted by pressure of the nut, into the position shown in Fig. 4.

It will thus be seen that there is provided a device in which the several objects of this bers being assymmetrical invention are achieved, and which is Well adapted .to meet the conditions of practical use.

i As various possible embodiments might be made of the above invention, and as various changes might be made in the embodiment set forth, it is to be understood that all matter herein set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention 1 claim as new and desire to secure by Letters Patent:

1. A wrench comprising a head having a pair of slotted jaws having portions adapted for slidably receiving a nut for engagement therewith, and members within said slots pivotally attached to said aws.

i 2. A wrench comprising a head having a pair of slotted jaws having portions adapted for slidably receiving a nut for engagement therewith, and members within said slots pivotally attached to said jaws, each of said members being shaped for engaging a plurality of sides of saidnut. a

3. A wrench for turning a polygonal nut having a plurality of jaws, each adapted to contact two sides of the nut and a member movably attached to each of said jaws and adapted to contact three sides of said nut.

4. A wrench for turning a hexagonal nut, and a pair of similar, symmetrically disposed members vniovably attached to said wrench andeach adapted to be moved by said nut into contact with three sides thereof.

5. A wrench having a head shaped for slidably receiving a nut, and a pair of symmetrically disposed similar members piv oted to said head and adapted to engage 0pposite sides of said nut.

6. A wrench having a head shaped for slidably receiving a nut for engagement with opposite sides of said nut, and a pair of symmetrically disposed similar members pivoted to said head and adapted to engage opposite sides of said nut, each of said memwith respect to its pivoted portion as and for the purpose described.

In testimony whereofI afiix my signature.

ALDO COLOGNORI. 

